zero pad pull tag number

Author: Simon Ejsing

src/GitVersionCore.Tests/VariableProviderTests.cs

@@ -172,7 +172,7 @@ public void ProvidesVariablesInContinuousDeploymentModeWithTagNamePattern()
         var config = new TestEffectiveConfiguration(versioningMode: VersioningMode.ContinuousDeployment, tagNumberPattern: @"[/-](?<number>\d+)[-/]");
         var vars = VariableProvider.GetVariablesFor(semVer, config, false);
 
-        vars.FullSemVer.ShouldBe("1.2.3-PullRequest2.5");
+        vars.FullSemVer.ShouldBe("1.2.3-PullRequest0002.5");
     }
 
     [Test]

src/GitVersionCore/OutputVariables/VariableProvider.cs

@@ -29,7 +29,7 @@ public static VersionVariables GetVariablesFor(SemanticVersion semanticVersion,
                     var numberGroup = match.Groups["number"];
                     if (numberGroup.Success)
                     {
-                        semanticVersion.PreReleaseTag.Name += numberGroup.Value;
+                        semanticVersion.PreReleaseTag.Name += numberGroup.Value.PadLeft(config.BuildMetaDataPadding, '0');
                     }
                 }